Push-button switch and a keyboard comprising the same

Details Push-button switch and a keyboard comprising the same Push-button switch and a keyboard comprising the same

1984-04-03

1985-07-16

Pellinen, A. D.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

200159B, 200340, H01H 312

Patent

active

045298491

ABSTRACT:
A novel stroke converting mechanism for a push-button switch is disclosed. The stroke converting mechanism is for providing a push-button switch or a keyboard comprising the push-button switches with features such as low cost, low profile, and light and comfortable key touch. The stroke converting mechanism is made from a plate of metal such as 18-8 stainless steel, and fabricated by a single shot of press or by an etching of the plate in a batch process. The delineated plate is then shaped into a specified form by die press. In spite of the simple structure, the stroke converting mechanism can provide a sufficient stroke conversion ratio, e.g., about 4 mm of the key top to a displacement of about 1 mm necessary for actuating a couple of make-break contacts. And also, it reduces the necessary depression force on the key top to a half of the force required for actuating a make-break contacts, and provides a reduction in the height of a push-button switch or a keyboard as much as 3 mm or more.

REFERENCES:
patent: 4467150 (1984-08-01), Leitermann et al.

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